JP2017044945A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector including an opening and closing mechanism for opening and closing a projection opening part with a simple structure.SOLUTION: A projector comprises: an exterior housing having a projection opening part through which light projected from a projection optical device passes; and an opening and closing mechanism 4 for opening and closing the projection opening part. The opening and closing mechanism 4 includes: a first cover 41 and a second cover 42 that have a state where they overlap with each other in a direction along an optical axis 36Ax of the projection optical device and open and close the projection opening part by being slid in a first direction crossing the optical axis 36Ax; and a support shaft 45 that is disposed outside the projection opening part, in a second direction crossing the optical axis 36Ax and the first direction, and supports the first cover 41 and the second cover 42 slidably in the first direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a projector.

  2. Description of the Related Art Conventionally, a light source, a light modulation device that modulates light emitted from the light source, a projection optical device that emits light modulated by the light modulation device, and an exterior housing that stores these devices, a screen, etc. A projector that projects an image on the projection surface is known. In addition, for the purpose of protecting the projection optical apparatus and the like, a projector including a mechanism that opens and closes an opening of an exterior casing through which light emitted from the projection optical apparatus passes is disclosed (for example, see Patent Document 1). .

The mechanism described in Patent Document 1 includes a lens cover, a cover guide unit, and a drive unit having a motor.
The lens cover includes a first cover, a second cover, a first fixing plate, and a second fixing plate. Each of the first fixing plate and the second fixing plate is provided with a guide shaft, the first fixing plate is attached to the end of the first cover, and the second fixing plate is attached to the end of the second cover. Yes.
The cover guide portion includes a guide main body portion, an upper guide portion, and a lower guide portion, and two rails are provided in each of the upper guide portion and the lower guide portion.
In the first cover, the guide shaft on one end side is inserted into one of the two rails of the upper guide part, and the other end is one of the two guides of the lower guide part. Inserted into the rail. In the second cover, the guide shaft on one end side is inserted into the other rail of the two rails of the upper guide portion, and the other end portion is connected to the other rail of the two guides of the lower guide portion. Inserted.
The mechanism described in Patent Document 1 includes a projection cover (exterior housing) by a first cover that slides when the driving force of the driving unit is transmitted and a second cover that is pulled and slid by the first cover. Open and close the opening.

JP 2012-194227 A

  However, the mechanism disclosed in Patent Document 1 has a complicated configuration, and since the first cover and the second cover are guided by the rail through a plurality of members, the accuracy of the component parts and the assembly must be increased. There is a problem that it is difficult to slide the cover and the second cover stably.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes a light source, a light modulation device that modulates light emitted from the light source, and a projection optical device that projects light modulated by the light modulation device. A projector, comprising: an exterior housing that houses the projection optical apparatus and has a projection opening through which light projected from the projection optical apparatus passes; and an opening / closing mechanism that opens and closes the projection opening. The opening / closing mechanism has a state of overlapping each other in a direction along the optical axis of the projection optical apparatus, and a first cover and a second cover that open and close the projection opening by sliding in a first direction intersecting the optical axis. A cover and a second direction intersecting the optical axis and the first direction are disposed outside the projection opening, and support the first cover and the second cover so as to be slidable in the first direction. support Characterized in that it comprises a and.

  According to this configuration, the opening / closing mechanism includes a first cover and a second cover that are overlapped with each other and supported by the common support shaft. The projection opening is opened and closed by sliding the first cover and the second cover. As a result, the storage space for the first cover and the second cover in the sliding direction can be reduced, the component members do not need to be processed with high accuracy, and the first cover and the second cover slide reliably with a simple structure. It is possible to provide a projector including an opening / closing mechanism that performs the above operation.

  Application Example 2 In the projector according to the application example, the support shaft rotatably supports the first cover and the second cover, and the opening / closing mechanism has the projection opening in the second direction. A guide part provided on the opposite side of the support shaft across the support shaft, the guide part restricting rotation of the first cover and the second cover relative to the support shaft, and the first cover and the first cover It is preferable to guide the slide of the two covers in the first direction.

  According to this configuration, in the second direction, the support shaft is disposed on one end side of the first cover and the second cover, and the guide portion is disposed on the other end side. The support shaft rotatably supports the first cover and the second cover, and the guide part restricts the rotation of the first cover and the second cover and guides the slide of the first cover and the second cover. Thus, the opening / closing mechanism can slide the first cover and the second cover with a light load.

  Application Example 3 In the projector according to the application example described above, the first cover includes a bearing portion into which the support shaft is inserted, and the bearing portion is moved to a predetermined position by sliding in the first direction. It is preferable that the second cover is slid in contact with the second cover.

According to this configuration, the first cover slides the second cover while the bearing portion comes into contact with the second cover at a predetermined position. Accordingly, the projection opening can be opened and closed by sliding the first cover.
Further, since the bearing portion is in contact with the second cover, the moment acting on the first cover and the second cover with the support shaft as a fulcrum can be reduced.
Therefore, a configuration in which the first cover and the second cover are slid with a light load while simplifying the opening / closing mechanism is possible.

  Application Example 4 In the projector according to the application example described above, the opening / closing mechanism has an open state in which the projection opening is opened and a closed state in which the projection opening is closed, and the bearing portion is When the first cover is slid from the open state to the closed state, a first bearing portion that contacts the second cover, and when the first cover is slid from the closed state to the open state, the second cover is provided. It is preferable to have the 2nd bearing part contact | abutted to a cover.

According to this configuration, since the first cover is supported by the support shaft at two locations (the first bearing portion and the second bearing portion), smoother sliding is possible.
Further, when the first cover is slid from the open state to the closed state, the first bearing portion comes into contact with the second cover, and when the first cover is slid from the closed state to the open state, the second bearing portion is the second. Contact the cover. Accordingly, the projection cover can be opened and closed by reliably sliding the second cover by bidirectional sliding between the opened state and the closed state of the first cover.

  Application Example 5 In the projector according to the application example, it is preferable that the first cover is disposed on the projection optical apparatus side of the second cover.

According to this configuration, in the configuration in which the first cover and the second cover are disposed inside the exterior housing (projection optical apparatus side) in the projection opening, the first cover and the second cover, the projection opening, It is possible to make the gap between the two small. That is, in the configuration in which the first cover is disposed outside the second cover (opposite to the projection optical apparatus side), a space for sliding the first cover is required outside the second cover. A large gap (a space for sliding the first cover) is generated between the second cover exposed from the first cover and the projection opening in the closed state. On the other hand, in the configuration in which the first cover of this application example is disposed inside the second cover, a space for sliding the first cover is required inside the second cover and is exposed from the second cover. For the first cover, the gap can be made small by providing a projection on the exterior housing.
Accordingly, since the gap between the first cover and the second cover in the closed state and the projection opening can be made small, intrusion of dust outside the projector from the projection opening in the closed state is suppressed, and projection is performed. It is possible to improve the appearance around the opening for use.

  Application Example 6 In the projector according to the application example, it is preferable that the opening / closing mechanism further includes a drive unit that electrically slides the first cover.

  According to this configuration, since the opening / closing mechanism includes the electric drive unit, even if the operation is performed using the operation buttons provided on the projector or the projector is suspended from the ceiling or the like, the open / close mechanism can be operated by remote operation using a remote controller or the like. The opening / closing mechanism can be operated to easily open and close the projection opening.

  Application Example 7 In the projector according to the application example described above, the driving unit includes an output unit that outputs a driving force and a transmission gear that transmits the driving force to the first cover. And a rack provided on the support shaft side in the second direction, the rack being provided along the first direction and meshing with the transmission gear disposed on the projection optical device side of the rack. It is preferable to form so as to.

According to this configuration, the rack of the first cover is provided in the vicinity of the support shaft, and the driving force from the driving unit can be transmitted to the rack. Therefore, the moment to the first cover with the support shaft as a fulcrum can be reduced to transmit the driving force from the output unit to the first cover. Therefore, the driving force from the output unit can be efficiently transmitted to the first cover, and the first cover can be smoothly slid.
The rack is formed so as to mesh with a transmission gear arranged on the projection optical apparatus side of the rack. Accordingly, even when an external force is applied to the first cover from the outside of the projector, it is possible to maintain the meshing between the transmission gear and the rack. That is, when an external force is applied, the first cover tries to rotate about the central axis of the support shaft, so the rack also tries to rotate. However, the rack and the transmission gear are arranged as described above. It is possible to prevent the rack from being separated from the transmission gear. Therefore, the opening / closing mechanism can open and close the projection opening even when handling is performed such that an external force is applied to the first cover.

1 is a schematic diagram showing a schematic configuration of a projector according to an embodiment. FIG. 2 is a perspective view showing a part of the front side of the external appearance of the projector according to the embodiment. The perspective view of a part of front case of this embodiment, and an opening-closing mechanism. The perspective view of the opening-and-closing mechanism of this embodiment. The exploded perspective view of the opening-and-closing mechanism seen from the front slant of this embodiment. The exploded perspective view of the opening-and-closing mechanism seen from the back diagonal of this embodiment. Sectional drawing of the opening-and-closing mechanism of this embodiment. The perspective view of the drive part of the state attached to the drive attachment part of this embodiment. Sectional drawing which shows the 1st cover and transmission gear in the opening / closing mechanism of this embodiment. Sectional drawing which shows the cover which has the rack formed in the position different from the rack of this embodiment, and a transmission gearwheel. It is a perspective view of the opening-and-closing mechanism of this embodiment, and is a figure showing the 1st intermediate state. The perspective view which shows the obstruction | occlusion state of the opening / closing mechanism of this embodiment.

Hereinafter, the projector according to the present embodiment will be described with reference to the drawings.
The projector according to the present embodiment modulates light emitted from a light source according to image information, and enlarges and projects the modulated light onto a projection surface such as a screen.

[Main components of the projector]
FIG. 1 is a schematic diagram illustrating a schematic configuration of a projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes an exterior housing 2 constituting an exterior, a control unit (not shown), a light source device 31, an optical unit 3 having a projection lens 36 as a projection optical device, a light source device 31 and a control. And a power supply device PS for supplying power to the components and the opening / closing mechanism 4. Although illustration is omitted, a cooling device for cooling the optical unit 3 and the like is further arranged inside the exterior housing 2. In the following, for convenience of explanation, in the projector 1 placed on a desk or the like, the projection plane side is defined as + Y side (front side), the left side viewed from the side facing the projection plane is defined as + X side, and the vertical direction upper side is defined as + Z side. Describe.

FIG. 2 is a perspective view showing a part of the front side of the external appearance of the projector 1.
As shown in FIG. 2, the exterior housing 2 includes a front case 21, an upper case 22, a lower case (not shown), a lamp lid, and the like.
As shown in FIG. 2, the front case 21 has a front surface portion 21F that forms the front side and an upper surface portion 21U that forms the upper side. The front surface portion 21F has a projection opening 211 that is circular in plan view. Yes. The light projected from the projection lens 36 passes through the projection opening 211. FIG. 2 is a diagram showing a closed state in which the opening / closing mechanism 4 closes the projection opening 211. Further, the projection opening 211 is not limited to a circular shape in plan view, and may be, for example, a rectangular shape. Although not shown, the exterior housing 2 is provided with an intake port for taking in outside air, an exhaust port for exhausting warm air inside the exterior housing 2 to the outside, and the like.

  The control unit includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like and functions as a computer, and controls the operation of the projector 1. The projector 1 according to the present embodiment is configured so that various operations can be performed by an operation panel (not shown) provided in the apparatus body, and remote operation by a remote controller is also possible.

The optical unit 3 optically processes and projects the light beam emitted from the light source device 31 under the control of the control unit.
As shown in FIG. 1, the optical unit 3 includes a light source device 31, an integrator illumination optical system 32, a color separation optical system 33, a relay optical system 34, an optical device 35, a projection lens 36, and these optical components on an optical path. An optical component casing 37 is provided at a predetermined position.

  The light source device 31 includes a discharge-type light source 311 composed of an ultrahigh pressure mercury lamp, a metal halide lamp, and the like, a reflector 312 and the like. The light source device 31 reflects the light emitted from the light source 311 by the reflector 312 and emits the light toward the integrator illumination optical system 32.

The integrator illumination optical system 32 includes a first lens array 321, a second lens array 322, a polarization conversion element 323, and a superimposing lens 324.
The first lens array 321 has a configuration in which small lenses are arranged in a matrix, and divides the light emitted from the light source device 31 into a plurality of partial lights. The second lens array 322 has substantially the same configuration as the first lens array 321, and together with the superimposing lens 324, the partial light is substantially superimposed on the surface of a liquid crystal panel described later. The polarization conversion element 323 aligns random light emitted from the second lens array 322 with substantially one type of polarized light that can be used in the liquid crystal panel.

  The color separation optical system 33 includes two dichroic mirrors 331 and 332 and a reflection mirror 333, and the light emitted from the integrator illumination optical system 32 is converted into red light (hereinafter referred to as “R light”) and green light (hereinafter referred to as “R”). G light ”) and blue light (hereinafter referred to as“ B light ”).

  The relay optical system 34 includes an incident side lens 341, a relay lens 343, and reflection mirrors 342 and 344, and has a function of guiding the R light separated by the color separation optical system 33 to an R light light modulation device 351R. The optical unit 3 has a configuration in which the relay optical system 34 guides the R light. However, the configuration is not limited thereto, and may be configured to guide the B light, for example.

The optical device 35 is a light modulation device 351 provided for each color light (the light modulation device for R light is 351R, the light modulation device for G light is 351G, and the light modulation device for B light is 351B), And a cross dichroic prism 352 as a color synthesizing optical device.
Each light modulation device 351 includes a transmissive liquid crystal panel, an incident-side polarizing plate disposed on the light incident side of the liquid crystal panel, and an emission-side polarizing plate disposed on the light emitting side of the liquid crystal panel. Connected to the control unit. The light modulation devices 351R, 351G, and 351B modulate each color light emitted from the color separation optical system 33 based on the supplied image signal to form image light of each color.

The cross dichroic prism 352 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. The cross dichroic prism 352 reflects the R light and B light modulated by the light modulation devices 351R and 351B, and transmits the G light modulated by the light modulation device 351G, thereby synthesizing the three colors of image light. To do.
The projection lens 36 includes a plurality of lenses (not shown) arranged along the optical axis 36Ax, and enlarges and projects the light synthesized by the cross dichroic prism 352 on the screen.

FIG. 3 is a perspective view of a part of the front case 21 and the opening / closing mechanism 4, as viewed from the inside of the projector 1. FIG. 3 is a diagram illustrating a case where the opening / closing mechanism 4 is in a closed state.
As shown in FIG. 3, the opening / closing mechanism 4 includes a first cover 41 and a second cover 42 and is disposed inside the front case 21. The opening / closing mechanism 4 opens and closes the projection opening 211 (see FIG. 2) when the first cover 41 and the second cover 42 slide in the X direction intersecting the optical axis 36Ax. The X direction corresponds to the first direction.
The opening / closing mechanism 4 protects the projection lens 36 when the projector 1 is not used, and suppresses intrusion of dust outside the projector 1 from the projection opening 211.

[Configuration of open / close mechanism]
Here, the opening / closing mechanism 4 will be described in detail.
FIG. 4 is a perspective view of the opening / closing mechanism 4, and is a view of the opening / closing mechanism 4 in an open state in which the projection opening 211 (see FIG. 2) is opened, as viewed obliquely from the front.
As shown in FIG. 4, in addition to the first cover 41 and the second cover 42, the opening / closing mechanism 4 includes a main body 43, a frame 44, a support shaft 45, a guide 46, a drive unit 5 having a motor 51, and a detection switch. 6a and 6b. The motor 51 corresponds to an output unit that outputs a driving force, and is connected to the control unit via a cable (not shown).
The opening / closing mechanism 4 is driven by the drive unit 5 in accordance with an instruction from the control unit based on an operation by a user operation panel or remote controller, and slides the first cover 41 and the second cover 42. As described above, the opening / closing mechanism 4 includes the drive unit 5 that electrically slides the first cover and the second cover.

FIG. 5 is an exploded perspective view of the opening / closing mechanism 4 as viewed obliquely from the front. FIG. 6 is an exploded perspective view of the opening / closing mechanism 4 as viewed obliquely from the rear.
As shown in FIGS. 5 and 6, the main body portion 43 has a base portion 430 having a rectangular shape in plan view that is longer in the X direction than in the Z direction, and an opening 431 having a circular shape in plan view in the center of the base portion 430. A concave portion 432 having a rectangular shape in plan view connected to the opening 431 is formed.
The opening 431 is located inside the projection opening 211 (see FIG. 2), and light emitted from the projection lens 36 passes therethrough. Further, the peripheral edge 431a of the opening 431 protrudes in the −Y direction.
The recess 432 is located on the −X side of the opening 431 and is recessed in the −Y direction. The concave portion 432 has a bottom surface portion 432a formed at substantially the same position as the tip of the peripheral edge portion 431a along the XZ plane, and a side wall 432b connected to the bottom surface portion 432a and the peripheral edge portion 431a.

Further, as shown in FIGS. 5 and 6, the base portion 430 has a plurality of bosses 433 formed near the + Z side end portion and a plurality of bosses 434 formed near the −Z side end portion.
The boss 433 has a cylindrical shape and protrudes in the −Y direction from the −Y side of the base portion 430, and a screw hole is formed in the center. The boss 434 has a cylindrical shape and protrudes from the base portion 430 in the + Y direction and the −Y direction, and a screw hole is formed on the surface on the + Y side.

  Further, as shown in FIG. 5, the base portion 430 has a rectangular shape in the vicinity of the + Z side end on the + Z side, and protrudes in the −Y direction at the −X side end portion of the protruding portion. Protruding portions 435 are provided.

  The frame 44 supports the support shaft 45, the drive unit 5, and the detection switches 6a and 6b. The frame 44 is attached to the −Y side of the base portion 430 and is disposed between the upper surface portion 21U of the front case 21 and the peripheral edge portion 431a of the main body portion 43 as shown in FIG. Specifically, the frame 44 is made of sheet metal and is formed in a long shape in which the X direction is longer than the Y direction and the Z direction. As shown in FIGS. 5 and 6, the frame 44 includes an attachment portion 441 along the XZ plane, a lower wall portion 442 bent from the −Z side of the attachment portion 441 toward the base portion 430, and an attachment portion 441. The upper wall portion 443 is bent toward the base portion 430 from the + Z side.

  As shown in FIG. 6, the attachment portion 441 has a plurality of round holes 441 a corresponding to the screw holes of the plurality of bosses 433. The frame 44 is attached to the main body 43 by inserting a screw SC inserted through each of the plurality of round holes 441 a into a screw hole of the boss 433.

  As shown in FIGS. 5 and 6, the upper wall portion 443 is provided with a drive attachment portion 4431 to which the drive portion 5 is attached. As shown in FIG. 3, the drive mounting portion 4431 is formed so as to be positioned in the + Z direction of the side wall 432 b in the main body portion 43. As shown in FIG. 6, the drive attachment portion 4431 is bent toward the lower wall portion 442 from the train wheel attachment portion 4431a protruding in the −Y direction from the attachment portion 441 and the −X side of the train wheel attachment portion 4431a. A motor attachment portion 4431b is provided. Note that an opening for forming a drive attachment portion 4431 is formed in the attachment portion 441 and the lower wall portion 442.

Further, as shown in FIG. 5, the frame 44 includes support portions 444 a and 444 b bent in the −Z direction from both ends of the upper wall portion 443 in the X direction, and + Z from the + Y side end portion of the upper wall portion 443. A bent portion 445 that is bent in the direction is formed.
A round hole is formed in the support portion 444 a provided on the −X side of the upper wall portion 443. The support portion 444b provided on the + X side of the upper wall portion 443 has a larger inner diameter than the round hole of the support portion 444a, and a round hole coaxial with the central axis of the round hole is formed.
A protrusion 445a having a rectangular shape in plan view is formed at the end of the bent portion 445 on the −X side. A protrusion 445b having a rectangular shape in plan view is formed at the end on the + X side of the bent portion 445. The protrusions 445a and 445b restrict the slidable range of the second cover 42, which will be described in detail later.

  The support shaft 45 is a shaft having a circular cross section, and one end thereof is tapered. The inner diameter of the round hole of the support portion 444a described above is formed to be larger than the outer diameter of the tip end on one end side that is tapered and smaller than the outer diameter of the main body portion of the support shaft 45 that is not tapered. The round hole of the support portion 444b is formed in a size that allows the support shaft 45 to be inserted. That is, the support shaft 45 is inserted into the round hole of the support portion 444b and the round hole of the support portion 444a in order at one end side that is tapered. The support shaft 45 is supported by the frame 44 with one end side inserted into the round hole of the support portion 444 a and the other end side inserted into the round hole of the support portion 444 b.

As for the support shaft 45, the taper-processed site | part latches to the round hole of the support part 444a, and the movement of the -X direction with respect to the flame | frame 44 is controlled. As for the + X direction with respect to the frame 44, as shown in FIG. 4, the movement is restricted by the protrusion 435 in the main body 43.
And the support shaft 45 is arrange | positioned so that it may extend in a X direction (1st direction). The support shaft 45 is disposed outside the projection opening 211 in the Z direction that intersects the optical axis 36Ax and the X direction (first direction). The Z direction corresponds to the second direction.

  The first cover 41 and the second cover 42 are supported by a support shaft 45 so as to be slidable in the X direction (first direction). The first cover 41 and the second cover 42 are arranged so that the first cover 41 is located on the projection lens 36 side of the second cover 42 and overlaps with each other in the direction along the optical axis 36Ax.

As shown in FIGS. 5 and 6, the first cover 41 includes a closing portion 411, a supported portion 412, and a guide portion 415.
The blocking portion 411 has a rectangular shape in plan view with the Z direction being larger than the X direction, and is formed in a size that covers the opening 431 and the projection opening 211 in the Z direction. Further, as shown in FIGS. 4 and 5, a depression 411 a that can be hooked by the user is formed in the central portion near the + X side end portion on the surface on the + Y side of the closing portion 411. By forming the recess 411a, the user can easily slide the first cover 41 manually.

As shown in FIGS. 5 and 6, the supported portion 412 is formed on the + Z side of the closing portion 411, that is, on the support shaft 45 side in the Z direction (second direction) of the first cover 41. It is formed by protruding from the + X side end of the portion 411 in the −X direction from the −X side end of the closing portion 411.
The supported portion 412 includes a pedestal portion 412a, two bearing portions (first bearing portion 413a and second bearing portion 413b), and a rack forming portion 414.
The pedestal portion 412a is formed in a plate shape and protrudes in the −Y direction from the + Z side end portion of the closing portion 411.

  As shown in FIG. 5, the first bearing portion 413a stands in the + Z direction from the −X side end portion of the pedestal portion 412a, and the second bearing portion 413b stands in the + Z direction from the + X side end portion of the pedestal portion 412a. doing. The 1st bearing part 413a and the 2nd bearing part 413b are formed in the position which mutually opposes, and the hole in which the main-body part of the support shaft 45 is inserted is formed in each. The first cover 41 has a support shaft 45 inserted in each hole of the first bearing portion 413a and the second bearing portion 413b, and is rotatably supported by the support shaft 45. The first bearing portion 413a and the second bearing portion 413b are disposed on both sides of the second cover 42 in the X direction (first direction).

FIG. 7 is a cross-sectional view of the opening / closing mechanism 4 as viewed from the + X side.
As shown in FIGS. 5 and 7, the rack forming portion 414 is formed on a portion connecting the −Y side of the pedestal portion 412 a, the first bearing portion 413 a, and the second bearing portion 413 b, and on the −Y side of this portion. The rack 41G is provided.
As shown in FIG. 7, the rack 41 </ b> G protrudes from the support shaft 45 to the −Y side (projection lens 36 side) on the support shaft 45 side in the Z direction (second direction) of the first cover 41. The rack 41G is provided along the X direction (first direction), and meshes with a transmission gear 532 described later disposed on the −Y side (projection lens 36 side) of the rack 41G.

  As shown in FIGS. 5 and 7, the guide portion 415 is provided at the −Z side end portion of the closing portion 411, follows the closing portion 411 in the X direction, and slightly on the −Y side from the closing portion 411 in the Y direction. It has a shifted shape.

As shown in FIGS. 5 and 6, the second cover 42 includes a closing portion 421, a supported portion 422, and a guide portion 424.
The closing portion 421 has a rectangular shape whose Z direction is larger than the X direction, and is formed to have a size that can cover the opening 431 and the projection opening 211 with the closing portion 411 of the first cover 41. .
The supported portion 422 is provided on the + Z side of the closing portion 421 and is formed in a box shape having an opening on the −Y side, as shown in FIGS. 6 and 7. As shown in FIG. 7, the supported portion 422 includes a wall portion 422a located between the support shaft 45 and the pedestal portion 412a, a wall portion 422b located on the + Z side of the support shaft 45, and bearing portions 423a and 423b. have.

  The bearing portion 423a connects the −X side of the wall portion 422a and the −X side of the wall portion 422b, and the bearing portion 423b is formed to connect the + X side of the wall portion 422a and the + X side of the wall portion 422b. Has been. The bearing portion 423a and the bearing portion 423b are formed at positions facing each other, and a hole into which the main body portion of the support shaft 45 is inserted is formed. The support shaft 45 is inserted into the respective holes of the bearing portions 423a and 423b, and the second cover 42 is rotatably supported by the support shaft 45.

  As illustrated in FIGS. 6 and 7, the guide portion 424 extends along the closing portion 421 on the −Z side of the closing portion 421 and is smaller than the closing portion 421 in the X direction.

  The guide part 46 is formed in a long shape extending in the X direction, and is disposed in the vicinity of the lower end part on the + Y side of the base part 430. That is, the guide portion 46 is disposed on the opposite side of the support shaft 45 across the projection opening 211 in the Z direction (second direction). The guide unit 46 restricts the rotation of the first cover 41 and the second cover 42 relative to the support shaft 45 and guides the sliding of the first cover 41 and the second cover 42 in the X direction (first direction).

Specifically, as shown in FIGS. 5 and 7, the guide portion 46 is provided in parallel with the base portion 461 that sandwiches the guide portion 415 of the first cover 41 with the base portion 430 and the + Y side of the base portion 461. A groove forming portion 462 is provided.
As shown in FIG. 5, a plurality of round holes 461 a corresponding to the screw holes of the plurality of bosses 434 are formed in the base portion 461. The guide portion 46 is attached to the main body portion 43 by inserting a screw SC inserted into each of the plurality of round holes 461 a into a screw hole of the boss 434.

As shown in FIG. 7, the groove forming portion 462 forms a groove 463 with the base portion 461. The groove 463 is a part into which the guide part 424 of the second cover 42 is inserted, and is formed along the X direction.
In addition, the distance between the guide portion 46 and the base portion 430 and the width of the groove 463 are set so that the first cover 41 and the second cover 42 slide without rattling.

The drive part 5 is attached to the drive attachment part 4431 of the frame 44 as described above and as shown in FIG.
FIG. 8 is a perspective view of the drive unit 5 attached to the drive mounting unit 4431.
As shown in FIG. 8, the drive unit 5 includes a reduction gear 52 and a transmission unit 53 in addition to the motor 51.

  The motor 51 includes a pinion 511 provided at the tip of a spindle (not shown) that is a rotating shaft. The motor 51 is screwed to the motor mounting portion 4431b so that the pinion 511 protrudes from the motor mounting portion 4431b to the + X side.

  The reduction gear 52 includes a large gear 521 and a small gear 522 that are stacked on the same axis, and is disposed on the −Z side of the train wheel mounting portion 4431a. The reduction gear 52 has a small gear 522 positioned on the + Z side of the large gear 521 and is rotatably supported on an axis centered in the Z direction provided in the train wheel mounting portion 4431a. In the reduction gear 52, the large gear 521 is engaged with the pinion 511, the rotation of the pinion 511 is reduced, and the driving force output from the motor 51 is transmitted to the transmission unit 53.

The transmission unit 53 includes an intermediate gear 531 that is screwed into the small gear 522, a transmission gear 532 that is positioned on the + Z side of the intermediate gear 531, a coil spring 524 that is disposed on the −Z side of the intermediate gear 531, and the like. The transmission portion 53 is disposed on the −Z side of the train wheel attachment portion 4431a, and is rotatably supported on an axis centering on the Z direction provided in the train wheel attachment portion 4431a.
The coil spring 524 biases the intermediate gear 531 toward the transmission gear 532.

The transmission gear 532 meshes with the rack 41G (see FIG. 6) of the first cover 41 and rotates together with the intermediate gear 531 biased by the coil spring 524. As described above, the transmission gear 532 transmits the driving force of the motor 51 transmitted through the reduction gear 52 and the intermediate gear 531 to the first cover 41.
Further, the transmission unit 53 is configured to cause slippage between the transmission gear 532 and the intermediate gear 531 when a predetermined force or more is applied to the first cover 41, and applies an excessive load to the motor 51. To prevent. Thus, the opening / closing mechanism 4 is configured to be able to slide the first cover 41 and the second cover 42 manually.

Here, the position of the rack 41G of the first cover 41 will be further described in comparison with a configuration in which the rack is formed at a position different from the rack 41G of the present embodiment.
FIG. 9 is a cross-sectional view showing the first cover 41 and the transmission gear 532 in the opening / closing mechanism 4 of the present embodiment, and is a view in the vicinity of the rack 41G. FIG. 10 is a cross-sectional view showing the cover 141 having the rack 141G formed at a position different from the rack 41G of the present embodiment, and the transmission gear 532, and is a view in the vicinity of the rack 141G.

As shown in FIG. 9, the rack 41G of the present embodiment is provided in the vicinity of the support shaft 45 so as to protrude to the −Y side from the support shaft 45, and as described above, the −Y side of the rack 41G (projection lens 36). And the transmission gear 532 arranged on the side). The rack 41G of the present embodiment is formed so that the rotation center axis 532j meshes with the transmission gear 532 in a posture along the Z direction. Thus, the transmission gear 532 and the rack 41G are arranged so that the transmission gear 532 is meshed with the −Y side (projection lens 36 side) of the rack 41G.
9, the rack 41G and the transmission gear 532 are arranged so that the rotation locus Ma at the tip of the rack 41G centering on the central axis of the support shaft 45 intersects the tooth bottom of the transmission gear 532. ing. That is, when an external force F is applied to the first cover 41 from the outside of the projector 1, the first cover 41 tries to rotate around the central axis of the support shaft 45, so the rack 41G also tries to rotate, but the rack 41G Since the transmission gear 532 is arranged as described above, the meshing between the rack 41G and the transmission gear 532 is maintained.

On the other hand, as shown in FIG. 10, the rack 141G of the cover 141 different from the present embodiment is formed such that the transmission gear 532 is meshed with the −Z side of the rack 141G. The transmission gear 532 meshes with the rack 141G with the central axis 532j in a posture along the Y direction.
The rack 141 </ b> G and the transmission gear 532 are arranged such that the rotation locus Mb at the tip of the rack 141 </ b> G centering on the central axis of the support shaft 45 is separated from the tooth bottom of the transmission gear 532. That is, when an external force F is applied to the cover 141 from the outside of the projector 1, the meshing between the rack 141G and the transmission gear 532 may be released.

  As described above, the opening / closing mechanism 4 of this embodiment can transmit the driving force of the driving unit 5 to the first cover 41 even when the external force F is applied to the first cover 41 from the outside of the projector 1. It is configured. Note that the rack 41G is formed so as to mesh with the transmission gear 532 disposed on the −Y side of the rack 41G, and the transmission gear 532 and the rack 41G are arranged so that the rotation locus Ma substantially intersects the tooth bottom of the transmission gear 532. And the transmission gear 532 may be arranged such that the central axis 532j is inclined with respect to the Z direction.

Next, the detection switches 6a and 6b will be described.
The detection switches 6a and 6b detect an open state and a closed state of the opening / closing mechanism 4.
Returning to FIG. 5, the detection switch 6a is disposed on the upper wall portion 443 in the vicinity of the support portion 444a, and the detection switch 6b is disposed on the upper wall portion 443 in the vicinity of the support portion 444b. Connected to the control unit.
The detection switches 6 a and 6 b have a movable part, and the connection state changes when the movable part is pressed by the first cover 41, and detects the open state and the closed state of the projection opening 211.

  Specifically, as shown in FIG. 4, the detection switch 6 a detects the open state when the movable portion is pressed by the first bearing portion 413 a of the first cover 41 in the open state. In the closed state, the detection switch 6b detects the closed state (see FIG. 12) when the movable portion is pressed by the second bearing portion 413b of the first cover 41.

[Operation of the open / close mechanism]
Here, the operation of the opening / closing mechanism 4 will be described.
The opening / closing mechanism 4 opens and closes the projection opening 211 by sliding the first cover 41 and the second cover 42 by driving the drive unit 5 based on an instruction from the control unit by an operation using an operation panel or a remote controller.
Returning to FIG. 4, the first cover 41 and the second cover 42 are stacked and stored on the −X side of the opening 431 in the opened state.
As shown in FIG. 4, the first cover 41 is in a state in which the first bearing portion 413a presses the movable portion of the detection switch 6a in the open state, and the detection switch 6a detects that it is in the open state.

In the open state, the second cover 42 is restricted from moving in the −X direction by the protrusion 445 a of the frame 44, and is restricted from moving in the + X direction by the second bearing portion 413 b of the first cover 41.
In addition, the first cover 41 is arranged so that the + X side end portion is positioned on the + X side with respect to the + X side end portion of the second cover 42 in the open state, and the hollow portion 411a is exposed. Although not shown, the recess 411a is also exposed to the projection opening 211 in the open state.

  When the operation panel or the remote control is operated so as to change from the open state to the closed state, the motor 51 is driven based on the instruction of the control unit, and the driving force is applied to the first cover 41 via the reduction gear 52 and the transmission unit 53. Conducted to the rack 41G. The first cover 41 is guided by the support shaft 45 and the guide portion 46 and slides in the + X direction.

When the first cover 41 is slid from the open state, the first cover 41 is separated from the detection switch 6a, contacts the second cover 42 at a predetermined position (first intermediate state), and slides the second cover 42.
FIG. 11 is a perspective view of the opening / closing mechanism 4 and shows a first intermediate state.
Specifically, as shown in FIG. 11, in the first intermediate state, the first cover 41 has the first bearing portion 413a abutting against the bearing portion 423a of the second cover 42, and the second cover 42 in the + X direction. Slide.

Then, when the first cover 41 slides together with the second cover 42 from the first intermediate state and moves to a position where the movable part of the detection switch 6b is pressed, the projection opening 211 is closed as shown in FIG. It becomes a closed state.
FIG. 12 is a perspective view showing a closed state of the opening / closing mechanism 4.
As shown in FIG. 12, in the first cover 41, the second bearing portion 413b presses the movable portion of the detection switch 6b in the closed state. The control unit stops the motor 51 based on the detection result of the detection switch 6b.

In the closed state, the movement of the second cover 42 in the + X direction is restricted by the protrusion 445b of the frame 44, and the movement in the −X direction is restricted by the first bearing portion 413a of the first cover 41.
As shown in FIG. 2, the front case 21 is provided with a convex portion 212 that faces the first cover 41 in the closed state. The convex portion 212 is formed so as to fill a step between the second cover 42 and the first cover 41 in the closed state. As a result, the gap between the first cover 41 and the second cover 42 in the closed state and the projection opening 211 is reduced.

On the other hand, when the operation panel or the remote control is operated so as to change from the closed state to the open state, the motor 51 is driven to slide the first cover 41 in the −X direction. When the first cover 41 is slid from the closed state, the first cover 41 is separated from the detection switch 6b, contacts the second cover 42 at a predetermined position (second intermediate state), and slides the second cover 42 in the −X direction. Let
Although the first cover 41 is not shown, in the second intermediate state, the second bearing portion 413b contacts the bearing portion 423b of the second cover 42 and slides the second cover 42.
Then, when the first cover 41 slides together with the second cover 42 from the second intermediate state and moves to a position where the movable portion of the detection switch 6a is pressed, the first cover 41 is in an open state as shown in FIG. The control unit stops the motor 51 based on the detection result of the detection switch 6a.

  In addition, since the opening / closing mechanism 4 is provided with a recess 432 (see FIG. 4), when manually sliding the first cover 41, the finger is not limited to the depression 411 a, but a finger is placed on the recess 432. The operation of inserting and gripping the first cover 41 is possible. Further, the recess 432 also has a function as a space for preventing a finger from being sandwiched between the first cover 41 and a member inside the first cover 41.

As described above, according to the projector 1 of the present embodiment, the following effects can be obtained.
(1) The opening / closing mechanism 4 includes a first cover 41 and a second cover 42 that are overlapped with each other and supported by a common support shaft 45. The projection opening 211 is opened and closed by sliding the first cover 41 and the second cover 42. As a result, the storage space for the first cover 41 and the second cover 42 in the sliding X direction (first direction) can be reduced, the component members do not need to be processed with high precision, and the first cover has a simple structure. It is possible to provide the projector 1 including the opening / closing mechanism 4 in which the 41 and the second cover 42 slide reliably.

  (2) In the Z direction (second direction), the support shaft 45 is disposed on one end side of the first cover 41 and the second cover 42, and the guide portion 46 is disposed on the other end side. The The support shaft 45 rotatably supports the first cover 41 and the second cover 42, and the guide portion 46 restricts the rotation of the first cover 41 and the second cover 42, and the first cover 41 and the second cover 42. The slide of the cover 42 is guided. Thereby, the opening / closing mechanism 4 can slide the first cover 41 and the second cover 42 with a light load.

(3) In the first cover 41, the first bearing portion 413a and the second bearing portion 413b are brought into contact with the second cover 42 at predetermined positions to slide the second cover 42. Thus, the projection opening 211 can be opened and closed by sliding the first cover 41.
Further, since the first bearing portion 413a and the second bearing portion 413b are in contact with the second cover 42, the moment acting on the first cover 41 and the second cover 42 with the support shaft 45 as a fulcrum may be reduced. it can.
Therefore, the structure which slides the 1st cover 41 and the 2nd cover 42 with a light load is attained, aiming at simplification of the opening / closing mechanism 4.

(4) Since the first cover 41 is supported by the support shaft 45 at two locations (the first bearing portion 413a and the second bearing portion 413b), a smoother slide is possible.
Further, when the first cover 41 is slid from the open state to the closed state, the first bearing portion 413a contacts the second cover 42, and when the first cover 41 is slid from the closed state to the open state, the second bearing portion is provided. 413b contacts the second cover 42. Accordingly, the projection cover 211 can be opened and closed by reliably sliding the second cover 42 by bidirectional sliding between the opened state and the closed state of the first cover 41.

  (5) The first cover 41 is disposed on the projection lens 36 side of the second cover 42, and the front case 21 is provided with a convex portion 212. As a result, the gap between the first cover 41 and the second cover 42 and the projection opening 211 in the closed state can be reduced. Accordingly, it is possible to suppress the intrusion of dust outside the projector 1 from the projection opening 211 in the closed state and improve the appearance of the projection opening 211 and the surroundings.

  (6) Since the opening / closing mechanism 4 includes the electric drive unit 5, even when an operation button provided on the projector 1 is operated or the projector 1 is suspended from a ceiling or the like, it can be operated by remote control of the remote controller. By operating the opening / closing mechanism 4, the projection opening 211 can be easily opened and closed.

  (7) The rack 41G of the first cover 41 is provided in the vicinity of the support shaft 45. As a result, the moment to the first cover 41 with the support shaft 45 as a fulcrum can be reduced, and the driving force from the motor 51 can be transmitted to the first cover 41. Therefore, the driving force from the motor 51 can be efficiently transmitted to the first cover 41 and the first cover 41 can be smoothly slid.

(8) The rack 41G is formed so as to mesh with the transmission gear 532 disposed on the −Y side (projection lens 36 side) of the rack 41G. As a result, even if an external force is applied to the first cover 41 from the outside of the projector 1, the engagement between the transmission gear 532 and the rack 41G can be maintained.
Further, the transmission gear 532 and the rack 41 </ b> G are arranged such that the rotation locus Ma intersects the tooth bottom of the transmission gear 532. Accordingly, even when an external force is applied to the first cover 41 from the outside of the projector 1, the engagement between the transmission gear 532 and the rack 41G can be reliably maintained.
Therefore, the opening / closing mechanism 4 can open and close the projection opening 211 even when the first cover 41 is handled such that an external force is applied.

  (9) The opening / closing mechanism 4 is configured such that slippage occurs between the transmission gear 532 and the intermediate gear 531 and the first cover 41 and the second cover 42 can be slid manually. Accordingly, for example, the first cover 41 that is in a closed state when the projector 1 is not used is slid to perform operations such as maintenance of the projection lens 36 (removal of dust attached to the surface, etc.).

(Modification)
In addition, you may change the said embodiment as follows.
The support shaft 45 of the embodiment has a circular cross section, but is not limited to a circular shape, and may be a rectangular shape, for example.

  The drive unit 5 of the above embodiment uses the motor 51 as the output unit. However, the drive unit 5 is not limited to the motor 51, and for example, a solenoid or the like may be used. And the structure provided with the lever member which expands and moves the movement amount of this solenoid and a solenoid is good also as a drive part.

  The opening / closing mechanism 4 of the above embodiment is configured to open and close the projection opening 211 by driving of the driving unit 5. However, the driving unit 5 may be abolished and configured to be opened and closed only manually. .

  In the projector 1 of the embodiment, a transmissive liquid crystal panel is used as the light modulation device 351. However, a reflective liquid crystal panel may be used.

  The light source 311 is not limited to a discharge lamp, but may be a solid light source such as a lamp of another type, a light emitting diode, or a laser.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior casing, 4 ... Opening / closing mechanism, 5 ... Drive part, 36 ... Projection lens (projection optical apparatus), 36Ax ... Optical axis, 41 ... 1st cover, 41G ... Rack, 42 ... 2nd cover , 45 ... support shaft, 46 ... guide part, 51 ... motor (output part), 211 ... projection opening, 311 ... light source, 351, 351B, 351G, 351R ... light modulator, 413a ... first bearing part, 413b ... 2nd bearing part, 532 ... Transmission gear.

Claims (7)

A projector comprising: a light source; a light modulation device that modulates light emitted from the light source; and a projection optical device that projects light modulated by the light modulation device,
An exterior housing that houses the projection optical device and has a projection opening through which light projected from the projection optical device passes;
An opening and closing mechanism for opening and closing the projection opening;
With
The opening and closing mechanism is
A first cover and a second cover that have a state of overlapping with each other in a direction along the optical axis of the projection optical apparatus, and that open and close the projection opening by sliding in a first direction intersecting the optical axis;
A support shaft that is disposed outside the projection opening in a second direction intersecting the optical axis and the first direction, and supports the first cover and the second cover so as to be slidable in the first direction; ,
A projector comprising: The projector according to claim 1,
The support shaft rotatably supports the first cover and the second cover,
The opening / closing mechanism has a guide portion provided on the opposite side of the support shaft across the projection opening in the second direction,
The projector restricts rotation of the first cover and the second cover relative to the support shaft, and guides the slide of the first cover and the second cover in the first direction. The projector according to claim 1 or 2, wherein
The first cover has a bearing portion into which the support shaft is inserted. By sliding in the first direction, the bearing portion abuts against the second cover at a predetermined position and slides the second cover. A projector characterized by causing The projector according to claim 3,
The opening and closing mechanism is
An open state of opening the projection opening, and a closed state of closing the projection opening;
The bearing portion is
A first bearing that contacts the second cover when the first cover is slid from the open state to the closed state; and the first bearing when the first cover is slid from the closed state to the open state. 2. A projector having a second bearing portion that abuts against the cover. It is a projector as described in any one of Claims 1-4, Comprising:
The projector is characterized in that the first cover is disposed on the projection optical apparatus side of the second cover. It is a projector as described in any one of Claims 1-5, Comprising:
The opening and closing mechanism is
The projector further comprising a drive unit that electrically slides the first cover. The projector according to claim 6, wherein
The drive unit is
An output unit for outputting a driving force;
A transmission gear for transmitting the driving force to the first cover;
With
The first cover has a rack provided on the support shaft side in the second direction,
The rack is provided along the first direction, and is formed so as to mesh with the transmission gear disposed on the projection optical device side of the rack.

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